1. Department of Periodontics and Oral Medicine, Division of Oral Medicine, Pathology, and Radiology, University of Michigan School of Dentistry, Ann Arbor, MI, USA
2. Department of Pathology, University of Michigan Medical School, Ann Arbor, MI, USA
3. University of Michigan Rogel Cancer Center, Ann Arbor, MI, USA
4. Department of Pathology, University of Chicago, Chicago, IL, USA